cli: Setup tracking branch on `rad remote add`

radicle-cli/examples/rad-clone-all.md

@@ -60,6 +60,7 @@ We can then setup a git remote for `bob`:
 ```
 $ rad remote add z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk --name bob
 ✓ Remote bob added
+✓ Remote-tracking branch bob/master created for z6Mkt67…v4N1tRk
 ```
 
 And fetch his refs:

radicle-cli/examples/rad-remote.md

@@ -3,6 +3,7 @@ Now, let's add a bob as a new remote:
 ```
 $ rad remote add did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk --name bob
 ✓ Remote bob added
+✓ Remote-tracking branch bob/master created for z6Mkt67…v4N1tRk
 ```
 
 Now, we can see that there is a new remote in the list of remotes:
@@ -17,11 +18,29 @@ rad z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi (push)
 You can see both `bob` and `rad` as remotes.  The `rad` remote is our personal
 remote of the project.
 
+For the remote-tracking branch to work, we fetch bob:
+
+``` (stderr)
+$ git fetch bob
+From rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk
+ * [new branch]      master     -> bob/master
+```
+
+We can now see the remote-tracking branch that was setup:
+
+```
+$ git branch -r -v
+  bob/master f2de534 Second commit
+  rad/master f2de534 Second commit
+```
+
 When we're finished with the `bob` remote, we can remove it:
 
 ```
 $ rad remote rm bob
 ✓ Remote `bob` removed
+$ git branch -r -v
+  rad/master f2de534 Second commit
 ```
 
 Now, add another time `bob` but without specify the `name`, so we should be
@@ -30,4 +49,5 @@ able to fetch the node alias from our db!
 ```
 $ rad remote add did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk
 ✓ Remote bob added
+✓ Remote-tracking branch bob/master created for z6Mkt67…v4N1tRk
 ```

radicle-cli/examples/workflow/5-patching-maintainer.md

@@ -16,6 +16,7 @@ peer.  Upcoming versions of radicle will not require this step.
 ```
 $ rad remote add z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk --name bob
 ✓ Remote bob added
+✓ Remote-tracking branch bob/master created for z6Mkt67…v4N1tRk
 ```
 
 ``` (stderr)

radicle-cli/src/commands/remote.rs

@@ -12,6 +12,7 @@ use anyhow::anyhow;
 
 use radicle::git::RefString;
 use radicle::prelude::NodeId;
+use radicle::storage::ReadStorage;
 
 use crate::terminal::args;
 use crate::terminal::{Args, Context, Help};
@@ -119,8 +120,12 @@ pub fn run(options: Options, ctx: impl Context) -> anyhow::Result<()> {
     let profile = ctx.profile()?;
 
     match options.op {
-        // TODO: Support remote-tracking.
-        Operation::Add { ref id, name } => self::add::run(rid, id, name, None, &profile, &working)?,
+        Operation::Add { ref id, name } => {
+            let proj = profile.storage.repository(rid)?.project()?;
+            let branch = proj.default_branch();
+
+            self::add::run(rid, id, name, Some(branch.clone()), &profile, &working)?
+        }
         Operation::Rm { ref name } => self::rm::run(name, &working)?,
         Operation::List => self::list::run(&working)?,
     };

radicle-cli/tests/commands.rs

@@ -832,6 +832,7 @@ fn rad_remote() {
     let bob = environment.node("bob");
     let working = environment.tmp().join("working");
     let home = alice.home.clone();
+    let rid = Id::from_str("z42hL2jL4XNk6K8oHQaSWfMgCL7ji").unwrap();
     // Setup a test repository.
     fixtures::repository(working.join("alice"));
 
@@ -844,11 +845,19 @@ fn rad_remote() {
     .unwrap();
 
     let mut alice = alice.spawn(Config::default());
+    let mut bob = bob.spawn(Config::default());
     alice
         .handle
         .track_node(bob.id, Some("bob".to_owned()))
         .unwrap();
 
+    bob.connect(&alice);
+    bob.routes_to(&[(rid, alice.id)]);
+    bob.rad("clone", &[rid.to_string().as_str()], &working)
+        .unwrap();
+
+    alice.has_inventory_of(&rid, &bob.id);
+
     test(
         "examples/rad-remote.md",
         working.join("alice"),